For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningInstallation Procedure
Clean and prepare the attaching surfaces for welding.
Apply one-part windshield urethane adhesive as noted from the original
panel.
Position the roof panel (1) on the
vehicle.
Verify the fit of the panel.
Clamp the panel into position.
Spot weld accor ...
Front Seat Belt System
The front seat belt system includes a driver and passenger seat belt
pretensioner retractor. Both front seat belt pretensioners includes a
seat belt switch in the seat buckle which controls a reminder lamp and a tone
alarm.
Note: The front passenger seat is equipped with a passenger
presence ...
Driver or Passenger Seat Replacement
Removal Procedure
Warning: Refer to SIR Warning in the Preface section.
Warning: When carrying a live inflator module, make sure the bag
opening is pointed away from you. This minimizes the chance of
injury in the case of an accidental deployment. Never carry the inflator module
by the wi ...